Why Does My Dog Keep Biting And Licking Himself?

Why Does My Dog Keep Biting And Licking Himself? Parasites. Among the most common causes for compulsive dog licking, chewing, or scratching behaviors are fleas, ticks, and mites. Although ticks are often visible to the naked eye, fleas often go unseen until there is a large infestation, and mites are microscopic. Why is my dog